Code-ringing telephone system.



I T. a; MARTIN. CODE mama TELEPHONE SYSTEM, I APPLICATION FILEIJ' FEB-24, I920. Reissued May 25, 1920.

1 1,863 2 SHEETS-SHEET I.

.TEZTETEN T. G. MARTIN. .0005 meme, TELEPHONE SYSTEM.

APPLICATION FILED FEB. 24, I920. B-eissued May 25, 1920.

- 1W Talia?! E. METIT'T.

UNITED STATES PATENT OFFICE.

TALBOT G. MARTIN, OF CHICAGO, ILLINOIS, ASSIGNOR TQ AUTGMA'IIG ELECTRICCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 013 ILLINOIS.

CODE-RINGING TELEPHONE SYSTEM.

Specification of Reissuerl Letters I 'atent. Reissyged fliay 25 132;) IOriginal No. 1,202,555,- dated October 24, 191G, Serial No. 652,781,filed October 4, 1911. Application for reissue filed February 24, 1920.Serial No. 362,031.

To all whom it may concern.

Be it known that I, TALBOT G. MARTIN, a citizen of the United States ofAmerica, and resident of Chicago, Cook county, Illinois, have invented acertain new and useful Improvement in Code-"Ringing Telephone Systems,of which the following 1s a specification.

' My'invention relates to telephone systems,

and more particularly to improved means for applying ringing current tothe called line.

It relates more particularly to means for applying code ringing to alocal battery telephone line upon which are located a plurality ofsubscribers lines. T hose lines are what are commonly known as farmerlines, and are usually menu-at magneto lines and hate enlarge number ofsubstations. "Heretofore when the siiibseribers have been permitted tocall theselines direct, it has been necessary forthe calling subscriberto know the ,particulaifi'inging code of the subscriber desired and tooperate his ringinc; button accordingly.

It is the object of my invention to devise means whereby this coderinging may be done automatically.

I have illustrated my invention. in connection with an automatictelephone system in which a series of automatic switches f 'the ringingrelay. This code selector differs somewhat from the ordinary frequencyselector in that the frequency selector may besin to ring as soon as theproper frequency has been selected and the connection completed. In mycode selector, however, the ringing cannot be started except at thebeginning oi? the code. If the interrupter happens to be operating whena connection is made, the code selector does not begin to ring thecalled subscriber until the interrupter has completed the cycle of itsoperation and is ready to start over again. This is a very importantfeature of my invention, as otherwise it would not be possible to alwaysobtain the proper operation for code ringing.

These and other objects of my invention will be more readily understoodby refer known and need not be described herein' At M 2) is shown aninterrupter device and apparatus for controlling the sani which is forthe purpose of causing; the are ply of ringing current to :1 called.polysta-' tion line to be interrupted according to a certainpredetermined code, so as to' cause the substations on the line to besignaled selectively. At L is shown a code selecting device which is forthe purpose of selecting the particular combination of interruptionsproduced by the interrupter M which interruptions correspond to theringing code of the particular substation desired.

The automatic substation A may be of any suitable automatic type. Asshown herein, the substation is a common battery three-wire automaticsubstation. By three wire substation is meant one in which means areprovided for controlling the automatic apparatus by ground impulsestransmitted over thetwo sides of the line sepa'atcly. Inaddition to theusual re eeiver 2, transmitter 3, induction coil 4, switch hook 5 andringer 6, the substation A is provided with. an automatic calling deviceof the well-known type coinprisingi' l', the impulse springs 7 and 8 andthe toothed The impulse wheel 9 is secured to a. shaft 10, to whichlatter there is also attached adial (not shown) proimpulse wheel 9.

. vided with finger holes.-

shown and J the switch hook and the" dial rotated.

In order to call any digit with this automatic calling device, thefinger is inserted in the hole in the dial corresponding to the digit tobe called and the dial is rotated around until the finger strikes asuitable stop. The drawn and the dial allowed to return to normaiposition. As the dial is drawn down, the impulse tooth 11 momentarilyforces the: spring 8 into cei'itact with the ground spring 12. As thedial. returns to its normal position, the teeth on the impulse wheel 9force the vertical impulse spring 7 into contact with the ground spring12 a certain number of times, corresponding to the digit called, afterwhich the tooth 11 once more forces the spring gronndspring 12. out ofengagement after the receiver has The spring13 is held with. the spring14 until been removed from The grin 15 on ,the switch hook momentarily,forces the springs 16, 1'4" and into contact is the switch hookdescends when the re ceiver iszgung up. The arm 19 permits the springsand 21 to separate whenever the dial is out of normalposition, so as toprevent imp lses from passing from one side of the line the other.

The subscribers individual switch C. and the master-switch. 'D are ofthe general type described in British Patent to W. James No. 26301 of1.906, and inthe llestcrn Electrician of Chicago, Illinois, of 35 January 25, 1908. Among the essential de tails the line switch Ccomprises a plunger (not shown) which is adapted, when released by theenergization of the trip magnet 22, to be forced into bank of springs23,24, 25, 26, 2?, 2 8, 29 and 3t), forcing them into contacflin pairsas indicated in the drawings? Twig line switch. 15 pim'ided with anumber such setsof springs, each set forming a terin'inalof a trunk lineleading to a selector E. The phmger of the line switch is controlled bythe master switch I) in such manneu thatwhen idle it is a-lwaysmaintained opposite an idle trunk line, The plunger of the line switchis restored from its operated to its normal position by the energizationand dcenergization of the release magnet 3L is pro videdfor the purposeof disconnecting the switch from. the line after it is operated. Themaster switch D comprises among other details a motor magnet 33 foroperating'a ratchet wheel 34. The ratchet wheel 34 controls the so-calied plunger shaft through the medium of the pins 35 and the arm 36 insuch a manner that, as the wheel 34; rotates, the plunger shaft carriesthe plungers of the idle line switches along in front of theirtrunkterminals. When the plunger shaft reaches the limit of its motion,the arm 36 finger is then withinto contact with the- The cut-off relaythe code selector L.'

slips oif one of the pins'35,

whereupon the spring 37 draws down the by restoring the plunger shaft toits normal position, so that during subsequent rotation of the wheel 7carried along in front of their bank contacts in the same direction asbefore. The master switch is provided with a bank of contacts comprisinga common segment 38 and one ind" *idual contact a for each trunk line towhich. the line switches have access. The wiper 39 keeps the commonsegment 38 in electrical connection with the individual contact of thetrunk line before which the plungers of the idle line switches areresting. The selector E is'of the general type of selectors shown inUnited States Letters Patent N 0. 815,321, granted to Keith, Ericksonand Erickson March 13, 1906. Amongother details the selector comprises aset of wipers 40, 4:1 and 42 carried upon a shaft (not shown) having avertical motion controlled by the so-called vertical magnet 43 and arotary motion controlled by the rotary magnet 44. The usual side switchcomprising the wipers 45, 46, 47 and 48 is controlled by the privatemagnet 49 in a well known manner. Means for restoring the switch tonormal positionjare provided in the usual release magnet 50. The switchis controlled from the calling substation through the medium rotary linerelays 511, lector F is essentia selector E.

The connector H (Fig. 2} is of the general typeset" connector switchesshown in United States Letters Patent No. 815,175, granted March 13,1906, to Keith, Erickson and Erickson, and comprises the usual wipers53, 54 and 55, vertical magnet 56 rotary magnet 57, side switch wipers58, 59 and 60, private magnet 61 and vertical and rotary linerelays 62and 63. The connector H is particularly adapted to connect a commonbattery calling line with a, local battery called line. The relays 64and 65 are slow acting relays-that is, relays which deenergize slowlyafter their energizing circuits have'been broken. This slow action maybe obtained by securing a ring of copper around one end'of the core ofthe relay. The usual ringing relay is omitted fromthe connector H and'issupplied in The code selector L comprises the apparatus shown betweenthe dotted lines in Fig. 2. The wipers 53, 5 1 and 55 shown at the rightof the selector L belong to the connector H.' The selector L comprises awiper 66 carried upon a rotaryshaft and adapted to rotate over and makecontactv with a bankof'contacts b. T e power for rotating the shaftisfurnished by the magnet '67. A release mag net 68 is provided forrestoring the shaft and The secbnd sely the same as the first of thevertiital and 1%,i's63 110 mm position. The imtgnct in the: bank of thecoclc sclectoi? L, tlicre and t rotary .magl'iot may be similar in their"1i7l0h aml construction to the rotary Impact and i 'eicusc timgilct thecon 22ml shown in councotoi llflitcutli 815,176. The sclcctor L isprovill with s c m'itl l '3. win...

' of this connect-o1 13 two positions.

siilu Al bv the in i1. mantis as m the L Eco mi "ultt f 1 t- 'c l5ivliio utter or mot-c :vllfilffi. 1pc relay pcrto'ims the sziuio tum uias tlio ordinal-V TU a relay in time coimcctor switclxcs-tlmt whenom-ii'gizctl it (liscom'icctstlie calling anti. the called lines andconnects the ringing current generator 3% with the called iiiie. Thecode ringing solcctoi L is individual to c connector there being onesuch u m for ooimcctoi" in that exchange,

which sol or adapted to call tlic local iizittm'y pa n imcs.

motor 56:" are vault. w is, hiring their rcvolw tiou tho :outuctlkiifi'flififi the spi'iiigs F38 and to w'oiliicc combinations at longimpulses (701715 ionrliug of different sul ations to the ri I pol; Theseiupu.

cnnti-olli g the ringing;- i-clay of the xtoil so as to muso tiiepto'pcr :1 line.

cl. 1 S7 ui'mngcrl to mocluce a short and u long impulse. Although onlytwo le ".vliccls are Sl'li'kflli, there would be {as many sr'iciii'vlu'o as there 2W8 su bs'tw tmm; on. the manual lino, ouch (30(l6Wheel. arranged to produce a con! ination hm in i! of impulsescorrespomling; to the ringing code of n dif'fcrcut, substzttiott'on the,line. The spring-s controlled. by each code WllGPl :n'o cmmcctoi'l to anindividual iits Contact 7) being many such contacts as tl cre aresubstations on the line The cotlc Wheels are set so that-they (lo notbegin to operate their springs until. after th'c shaft has rotatccl.li'm" ofooug" to! the wheel 8' .o separate the s r rings ili ami-pei'mittlicm to close i. (if coutssit will be unilcc stood that theintci'i'uptci' tlc'vicc 1118: be

common to all of the cotlc selectors l. in

the JiC-llfillfi. If cl sited, time code Wheels 8?. 87".. etc... may be"cngctl to their 01 more Mi'YlQS (luring a siup lc It will live a"Ulllflil t; substation No. i, on 111115 on. a. manual l suliustuticu Ai is) Thurs. c, in order to call the substation A, the: automaticsubsor. must operate his (2 Hing (.lQVlCt' l'fil." tlio number .Z-W-Ul.'tlic sulstation dia down to .Citll the first dig comer has been removedLtrom c swi {.l'il E5 is imon'ientm"y urcsscil tli tine spring 3.52,".fi*ll3i%1i'-3l)'j. no A 7 1S scnttram uml Ll through t spru' :2 l3 andi Hull 8, y'} r in. r iUufltfiy mic coiicuctor 9o, spungs M ill 1 L8?trip nug t 552, springs 1.00 and iii $.02 and magnet to the but" i 2.1111tlicticetin-0mg 3 the butt/cry .3 gyoui'id ii. The wt 33 is notopen ti. 1* ct 1 1- gizcd o V91 this UltT-lllll. The maggn t uponenmg'iziug. rel- ")lt lilgi of the line switch. zallowii Y it to tothrust into the lack to close tile 5; into coutuct in guilt-s, as shown.its closure of cont-uct between. tho so .HFFS 1,3 and. il and 25 and 26extends the in t tici'ifii'om the oz lliiig lino to the iii e0. p11},

The closure cl ontact between the springs 29 and 30 {:Oh lctcs circuitfrom ground G through said 5; lugs 29 and 30 ziiul the cut-off relay 52to the battery lead 105. The relay 32, upon energizing, disconnects thetrip magnet from the calling; line. The engagement oi. the bunk springs25% and 30' also extends a. guarding potential from ground Ur over the.co idnctor 106 to the private bank contacts of the callinglino in thebanks of all time connectors which have access to said. line. Theengagement of the subs-Minn A my boot? sonnet: with and s ml i 1* at it.

' the I filo.-

bani: spring. 2? and 28 of. the line switch CUInlDlQtQS en energizingcircuit for the diflcrentiully-wounil relay 107 the master swi 1b 1).This circuit extends from ground. G through the lower winding of therelay 107, segment 39, contact 108 {xx-inch, it is essumeu, corr oonilsto the trunk line lending to the selector E), bunk springs and i2? andmagnet 31 to battery. The magnet 2-51 does not. rec '.'ve suilicicntcurrent over this energized. '1 l e relay however, operates to open thecontuct between the springs 100 and 1.01 and to close the contactbctweei'i the springs Gland 109, whereby the trip magnets of all theline switches which are controlled.

- bv the master switch D are disconnected. from l; ttery and en circuitis nosed through the motor magnet 33. Since this. circuit .ii'icludesthe interrupter springs 10% the n'mtor magnet 33 thereupon begins torate s nizinner similar to that of a buzzer to rotate the wheel step bystep to advance the plimgers of the idle line switches away from thetrunk seized by the switch C toward an idle trunk. If the first trunkafter the one seized by the switch. U is idle, the wiper 39 breaks thecircuit of the relay 10'? as soon as it is carried off the COTllJL'LGl)8 the first step of the master switch. The relay 10? thereupon returnsto normal position and breaks the circuit of the operating in net 33.If, however, the nest trunk is b in the nuistcr switch bank, and themotor magnet 33 operates advance the plungers another step. The motormagnet will continue to operate in. this manner until the wiper 39leuves the contact of the last busy trunk, so that the plungers do notcome to until idle trunk is reached.

' conductor 96, springs "23 and 24, side switch wiper 45 and verticalline rcluv 51 of the selector E to the battery lead 165. The relay 51.,upon energizing, completes a. circuit from ground 6: through. thesprings and 111, 112 and 118, and the vertical magnet 43 to the batterylead 105. Since two impulses are delivered to the vertical relay 51,

the vertical. magnet also receives two pulses and operates in responsethereto to ra se the switch shaft and wipers two steps.

The final engagement of the spring 8 with circuit be operutively theenergizing circuit of t r lu' 1o? maintained through the next 'tion,extends .a guarding potential.

: through said wiper 47, rotary magnet 14; and

interrupter springs 115 to battery. The ro tary magnet thereupon beginsto operate in manner similar to that of abuzzer to rotats the wipers{10,141 and 42 over the contacts in the second row or level of s'electorbank. The rotary magnet continues to advance the wipers step by steplong as the side switch remains in second position. If the first trunkline in the second level is idle, the side switch will. be stopped from.second to third position by the first operation of the rotary magnet.This is arc-com.

plished by a finger on the armature of the rotary magnet which presses(lown'the ermib ture of the private magnet when the rotary magnet isenergized. If the first trunk is busy, however, the side switch is nottripped to third position upon the first energizetion of the rotarymagnet, because the private batik contact of said busy trunk-will beprovided with a guarding potential, and as soon as the wiper 41 engagesthe said contact a circuit is closed from this guarded contacttlirouglithe wiper 11, relay 116, side switch wiper 48 (in secondposition) and private magnet 49 to battery. The armature of the privatemagnet, therefore, remains held up after the rotary magnet denergizesand locks the side switch in second position.

The relay 116, which is included in the locking circuit of theprivetemugnet, is not operutively energized, due-to the comparativelyhigh resistance of the magnet l9. The side switch being locked in secondpdsi tion, the rotary magnet will continue to ad.- vance the wipers stepby step until the private wiper 41 passes off the last guarded contact,whereupon the private magnet 19 ileinergizes' and permits the sideswitch to with their third-position contact points ex tends the lineconnection through the selector E to the second selector F. Tlieiside.switch wiper 48, upon reaching third p051- ground G through the wiper18, relay 1'16 and private wiper 41 to all the first selector tom 'theshaft 79.

relays 134and 135, release ma net 68. Vhen the rotary line relay 63 othe connector H energizes in response to the final rotar impulse vof thelast di 't, a circuit is close from ground Gr throng the springs 122 and130, springs 131, private magnet 74 of the code selector, springs 77 and76 to battery. The magnet 74 upon encrgizin" and denergizing, causestheside switch oi the code selector to pass to second position. Ofcourse, the private magnet 61 of the connector H will be enerized by thefinal rotary impulse, but this l ias noeffect, since the side switch ofthe connector has already reached the limit of its travel. Thesideswitch wipers 72 and 73 of the'code selector, upon reaching-the secondposition, finally complete the'connee tion between the calling and thecalled :lines. The side switch wiper (1', upon reachin 1 its: secondposition, completes the circuit roln' ground G through the wipers 71,58, and 54 and the cut-off relay 90 of the called line. The relay 9 uponenergizing, disconnects. the drop 89 from the line. A guardin potential.is also. supplied from groun G over the circuit just traced to theconnector private hank 93 and the test ring of the jack 91 to protectthe called line from being again seized either automatically ormanually. In order .-to finally signal the called subscriber the callingsubscriber must press the ringing button 234, wherehy a circuit isclosed from ground G through the springs .13 and 14, 235 and 234,springs 21 and 20; vertical line 96, thence to and through the relays 62and 121 of the connector .H to battery. The relays 62 and 121, uponenergizing, complete a circuit from ground (i through the side switchwiper of the code selector L over a circuit which has been alreadytraced, thence through the second-position contact point of said wiper,springs 138, relay 135k relay lii land springs 75 and 76 to battery; The

relay 13$) upon energizing, completes a circuit which forms a lockingcircuit for itself and the relay 134 and causcs the relay 14E of theinterrupter M to energize when the ringing; huttonat the substation isreleased. This circuit extcnds from ground G through the relay 141 ofthe interrupter de vice M. springs 83 and 140 and the relays its) and13-; to battery.

The relay 1-H, upon 'eiu-rgizing, closes'the circuit of the relay H2,which operates to close the circuit of the motor which rotates .Utcr theshaft is rotated a short distance, the wheel 82 separates the springs83, thcrchy breaking the locking circuit oi the relays 139 and 134. Therelay 134, being slow acting, docs not (ll-Energize immediately, but therelay 13!), being (puck acting, dci nergizes immediately and c oscs anew locking circuit for; the relay 134.

private magnet 74 and M hccl S2 separates the springs 85;,

This circuit extends from ground G through the relay 141, springs 85 and143,

relay 144, springs 145 and re y 1% to battery. Therelay' 134 thereforeremains energized when the relay 139 denergizes, while at the same timethe relay 144 energizes to separate the springs 138, so that the callingsubscriber cannot interfere with the opera-.-

tions by age in pressing'the signaling button.

The relay 134 being energized and the relay 139 being deenerg'ized, thecircuit is com pleted f-romef'ithe lower spring of the pair 88controlled by tlie eode wheel 87, wiper 66 springs 146 and 145mm ringingrela 78 to battery. 'Duringjits revolution the w reel 87 closes thecontacts between the springs 88 twlce, thereby twice closing the circuitof the ringing relay 78 for a predetermined period. Each time theringing relay energizes it disconnects the calling line from the calledline and connects the ringing generator S with the called line. Sincetwo impulses are sent through the line.

rent will sent out over the call Thiswill, o f course, ring all thebells on the ringing relay, T two-correspgndmg impulses of rmgm cur-'line, but since each substation has a difier; ent signal, only thesubscriber at the. desired substation A will answer. After all the codewheels haveoperated their springs for the last time, and before thewheels hnall rates the springs 85, thereby breaking the lockinglcircuitof the relays 1&4 and 134. The interrupter device will come to restreach normal position, the wheel. 84 seps 10 0 when the wheel 81reaches. normal position and allows thesprings 86 to separate, there; iby opening the 'circ. i of the magmet'l igf which controis the rmtorrircu'it,

From the above description of the opera;

tion of the code selector L, it will be seen that the circuit from theringing relay to thesprings of the codewheel is not closed inn mediutelyupon the operation of theringing button at the calling :urhsts'tion, butthe apused by some other subscriber at the time the subscriber atsubstation {Apresses his ringing button, the rmgingreluyTB will notbegin to be operated until after the-code whcels have completed theirrevolntioni'and it our be are ready to start over again.

evident that if. the circuit of the relay were closed through to tnesrisgs-nf;. the code wheel as soon as theringing ush button were pressed;and if the interrupter 1215 wheels might be partnvayaroiind, and thedevice were already operating; the code ringing relay, would loose oneor more of its, impulses. thereby giving the wrong signal. With thearrangement shown herein, the code whcc'ls cannot begin to send impulsesto no puratus is placed in a condition whereby the winging- 615.3 exceptat the Lginning f the 00 ie.

During the conversmbion the local; battery substation of cause receivastamingentrant from its own local batmry The common battery aufi'n'mt-icsubstation receives talk :Eng mureui; from Hm central ofiiue battery 3over a inmit wlhiuh mzbendsfr-om ground inn-enter H through he swing vr'rindmgg U1"? a'eha 1351;, wt: rchqy 1 gfiwnw 1m and 'lthmugn thecalling substation and back 0 03:" the uihm" sirhauf the line throughizhewerm 11 relay (5:? of the connectm," and 'm p ar winding; of therelay inter relay 1531., 09mg @ifiermt em: l by this tafiizing (mp112115;, WI; the mation relays and, 3 is anatic! After Him convey hecaning descends, iinnmenir (v v m wntamk verbicai and 1'0 i Thegroundreiay 1:21 The relay 1521, ixing v aha circuii of the rem m usmanner. The 1-day 6+2 upon ek'lergiziug, Shift; the low-er winding mi16- miuy 121 from the glmlmdv'l My? 1% non-gn'mulc'imi terminal of theba jxecomesg zanezrgizerl, Envivw' in tha fact that Hm rotary Him: 95 isminded at the slfl'rstation release. 5 "..i11g; The relaya 654% MM 53,113mm emergizingfclnse the :imuit m? the pi'ivwt a magma-5 51 in thesame manner as has; '4; hkined. The mm rained e1 the: relays and mindthe an; fill con'bpiei'es a Circuit" from. YYOIL 215.1 13 151 .3; thebattery E em 5 energizing, complete from gzmimd G and reimy 65 to:

121, spar-h1g5 I.

"be 5witch es H and L in multiple t0 battm'y 10m? 10.. The magmas-ts157' am? 69 01" the switches H anc'i L immediately restore the wipersand the sick: swim-hes of their respective switches to normal positizin.The relay 154 of the se- 30mm: P] upnn energizing, completesa cirmii; w;wading; i'mm can i? "3 mi; the Selec- Lm' I? thmugn th s suie switchWiper 48, are my HG, privatize wipa' "L1, springs and Pfleahe Hummer 1'9 oi. the selectmr F to the battery lead 105. The 11-51% 11% of theselemlm: upon energizing, the circuit of thp release magnet The reieasemagnw; 50., upon energizing! cfios'ax' a circuit from magnets 15?, and

s tha wanes-1011 0f 3E finmigh the Bl-EH32 net 31 0;? Kim ime swiznch C13:3 "as'zi: Wyn 121a idlt their 11 m madnless t0 re? armmures and.110561 $11" their res vcicive svjiaclms when the magi its are, denergmed. The subsmizwn 1'0 t' clezase springs SE'DZUTLITQ and rsmmrathe grow. mi from {he line conduct-ms and jusafi ize'fm s the switchhnokreache of its (Mmwmrd 1m an; 1'31 of the zuiumjgtm' Teugx 1 den '25e 7 and tweak: the a "'he Shaw ing; miay This relay d rm-3s after :1 sizwri time and imeaks the circu 1; of the ifehe s 68 and 157 and of thsrelease E612? the: selmcfiozr F. relay g1) 1% 012m in mm (If nmrma langry m Y ma Aha i m, a

m 1.10%?13 gm explained Wh-L "wailing,

n the r saw mufe @6391" L- cuit over which the busy signaling currentflows extends from one terminal of the machine T through the sideswitch. wiper 59 condenser 162, thence over the heavy conductors to andthrough the calling suhsta tion and back over the other side of theline, through the relays 62 and. 121 of the connector to the batterylead 105, and thence to the other terminal of the busy signaling Ina--cliine.

Vvhile I have illustrated my invention in connection with an automatictelephone system of Well-known type, it is to be understood that myinvention not limited to such use, but my improve, "mSBHSA-fOI WUtQ-matically applying co lie r vging to thesu scribers lines is capable ofuse in telephone systems broadly, and I do not desire to limit myself toany particular type of system.

'What I claim as my invention is:

1. In a telephone system, aparty line, a plurality of substations onsaid line, a plurality of sivitching devices each of which is operableto automatically predetermine a code signal, mechanism common to saidswitching devices for signaling said stations according to thepredetermined code, and

automatic means to insure that the code is always applied to the line atthe beginning.

2. In a telephone system, party lines, a plurality of signals on each ofsaid lines at the substations, a source of ringing current, a pluralityof switching devices each operable to connect said source with any oneof said lines, whereby a plurality of said lines may he signaled at thesame time, a common mechanism for controlling the application of saidsource of connected lines in accordence with predetermined codes, andauto matic means to insure that the said source applied to each line atthe beginn ng of the code.

g 3, In a telephone system, a party-line, fa plurality of signals onsaid line, a. source of ringing current, a relay for connecting saul D:nterrupters for controlling said relay Hil'fif ltilllg" to apredetermined code. i

4. In 4i telephone system, a party-line,e

source of ringing. current, a relay for con-- necting said source withsaid line, a plural ity of interrupters for controlling the according toa predetermined code, and a stcp-l y-.;tep-operated device forconnecting the relay with any desired interrupter. I

In a telephone system, a party-line, a plurality of signals on saidline, automat callycontrolled means: for operating said. signalsaccording to a prei'leterminerl code,

and means for rcnderin said 'oieratin means inoperative exce 'itat thebeginningof the code series.

6.1x a telephone system, a-party-line, e plilrnhr ijol signals on saidline, a source of Liuging current means including a plural current withthe line, and a. plin'ah plurality of s1 in use.

for connecting current with the lineeX- j 8c cept when said interruptersare at the he ginning of cool-e series.

8, In a telephone system, a party-line, a source of singing cmrent, arelay for connecting said source with said line, a plural' ity ofinterrupters for controlling said relay according to at predeterminedcode, a stepby-step-operatecl device for connecting said relay with anydesired interrupter, and. means for rendering said relay inoperative forconnecting said source with the lineexcept when said interrupters arrestthe beginning of the code series,

9. Inv a telephone system, party lines, plurality of substations on eachline, a common'code ringing machine, plurality of devices each operableby a calling subscriber to predetermine a code signal, means controlledby the calling subscriber for signala desired. station according to theselected code, and automatic means to insure that the signalingoperation is started at the beginning of the code.

it). In a telephone exchange system, party lines, a plurality of signalson. each line at the substations source of ringing current, means thecentral under the cow trol of a calling subscriber for connecting saidringing current source with. a desired. line so .as to operatethesignals thereon according va predetermined code, a com noon coderinging-machine adapted to co per-ate in plurality of such c erationssimultaneously, l and automa means to insure Zing opera tion is et-artsthe heginnr. 'ot' the coils ll. In a telephone a partly-ll a pluralityof si "is said line, a mart-e ol ringing current, a relay forconnci'rting said. ringing current with the line, a plurality ofinterrupter-s for controlling; said relay according to a predetermined.code. and lneans-uni'ler the control of the walling suhsaid connectionof the plurality of substations on s'aid line, means including one ormore automatic. switches for extending a connection to said line, meansunder the control of the calling sub- 5 scriber for automaticallysignaling said stations: according toa predetermined code, a machinecommon to the exchange for producing the code signals, and automaticmeans to insure that the code is always applied to the line at-thebeginnin".

26. In a telephone system, a party-line, a

plurality of signals on said line at the substations, means includingone or more antomatic switches for extending a connecle fion to saidline, a source of ringing cur- I Agar 1t, means under the control of thecalling zsubscriber for connecting said ringing current with the line soas to operate said signals according to a' predetermined code, a machinecommon to t .exchange for producing the code sig ls, and automatic meansto insure that t {code is always ap .plie.d to the line at the. beginnin27. In a telephone system, a party-line, a pluralityof signalson saidline, means includingpiieioimore automatic s i tches for extending aconnection-to said line, source if ringing current,af'relayffor"connecting rid ringing current with the line, a pluralityof inter'filpters for controlling said relay accord 11 .toapredetermined code,

and ea in; air the control'of the calling .subsc' for controlling saidconnection of th idgirllg current with the line.

{28';;ln=-atelephone system, a party-line, hie-ans including one -ormore automatic switches for fextending a connection to said line, asource of ringing current, a relay for-connecting said source with saidline, a plurality of interrupters for controlling therelay according toa predetermined code, and a step-by-step-operated device under thecontrol of the calling subscriber for connecting the relay with anydesired interrupter.- r v In a telephone system, a party-line, aplurality of substations on said line, means including one or moreautomatic switches for extending a connection to said line, means underthe control of the calling subscriber for automatically signaling saidstations according to a predetermined code, and means for rendering saidoperating means inoperative except at the beginning of the code series.

30. In a telephone system, a party-line, a plurality of signals on saidline at the substations, means including one or more automatic switchesfor extending a connection tosaid line, a source of ringing current,means underthe control of the calling subscriber for connecting saidringing current withthe line so as to operate said signals.

according .to a predetermined. code," and means for rendering saidconnecting means inoperative except at the beginning of the code series,

. 31.111 a telephone system, a party-line, a plurality oi signals onsaid line, means including one or more automatic switches for extendinga connection to said line, a source of ringing current, a relay forconnecting said ringing current with the line, a plurality ofinterrupters for controlling said relay according to a predeterminedcode,

means under the control of the calling subscriber for controlling saidconnection of the ringing current with the line, and means for renderingsaid relay inoperative for connecting said ringing current with the lineexcept when said interrupte'rs are at the beginning of the code series.

In a telephone system, a party-line,

means including one or more automatic.

switches for extending a connection to said line, a source of ringingcurrent, a relay for connecting said source with said line, a pluralityof interrupters for controlling the relay according to a predetermined.code, a step-.liy-st'epoperated device under the control of the callingsubscriber for connecting the relay with any desired interrupter,

and means for rendering said "relay inoperative for connecting saidringing current with the line except when said interrupters' are at thebeginning of the code series.

' In a telephone system, a party-line, a plurality of signals on saidline, means for operating said signals according to a prede- 'terminedcode, said means including a stepline except when said first mentionedinterrupter-s are at the beginning of a -;:ode serles.

35. In a telephone system, a plurality of subscribers lines, a group ofautomatic connector switches having access to said lines, callingdevices for controlling said connectorsvto connect with desired dulledlines, a source of ringing current, an iinniliary step-by-step switchindividual to each of said connectors and also subject to callingdevieepontroha common mechanism accessible to said auxiliary switchesfor automatically applyingringing current to called I .operatesaidy'signals, and automatic means a plurality of lines according topredetermined-codes, and

automatic means to insure that each code is always applied to a calledline at the beginning. 4

36. In a telephone system, means mcluding one or more automatic switchesforentending a connection from a calling to a called subscribers line, acalling device for controlling the operation of said switches, a'sourceof ringing current, a series of interrupters, a step-by-step switchunder the control of said calling device for selectihg one of saidinterrupters tocontrol the "application of ringing current to the dineaccording to a :predetermined code, lmeaiis under the control of thecalling sub- 'iibelt, for connecting said ringing current with the line,a second called line and means for applying "code signaling currentsthereto under control of the same.

interrupter, and automatic means to insure that the code isalwaysflapplied to each line at the beginning.

37. In a telephone system, aline, a plurality of'sifgnals associatedwith said line, a plura-lityfpf' difierent mode senders operating "said'signalmapluralfty of electrically controlled mechanisms eaehof whieh isoperable for selecting any-one of said code senders applyingit to thesaid line tosen'd th'e code signal thereover to for ,ndntrbllirig thesenders to insure that "M eqch,..@de 'signal always begins at the he-38f' l1'l a telephone system, a plurality of i-llhes, a plurality ofsignals associated with .each of said lines, a device comprising aplurality of code senders for operating said signals, \a plui'ality ofelectrically controlled, means for selecting any one of said lines, eachsuch. means including a device for selecting any one of said senders forapplying the sender to the selected line to send a code signal thereoverto operate the signals on said line, and automatic means for controllingthe senders to insure that each code/j always begins at thebeginning.

39. In a telephone system, party lines,

connector switches for completing connections to said lines, a codesignaling machine common to said switches 1 for signalingrany desiredstation on a connected line according to a predetermined code, and.automatic means 'for insuring that the code signal is always deliveredto the line from the beginning.

40. In a telephone system, party lines, a ,)lurality of stations on eachof said lines,

a source of ringing current, a code ring.

ing machine, a plurality of switching do vices each of which nectingsaid machine to alla; desired station thereon accordmgt f predeterminedcode, and automatic for ' connection is operable for con-. with anydesired line of the calling,

signaling said stations aeeording to a prede-v I means for insuring thatthe code is delivered to the line from the beginnin 41. In a telephonesystem, a party line, a plurality of signals on said line, automaticallycontrolled means for operating said signals according to a predeterminedcode, and automatic means for rendering said operating means inoperativeexcept at the beginningof the code series.

42. In a telephone system, a party line, a plurality of signals on saidline, a source of ringing current,electrically controlled eratiye forconnecting said current with the line except Wl envsaid intern .ptorsare at the beginning of the code 's'eriuasr 1" 4A. In atelephone system,a party-line, a source of ringing current, a. relay for connecting saidsource rality of interru'pters lor'controlling said relay according to.a; predetermined code, a step-by-step-operated device for connectingsaid relay with any desired'interrupter, and automatic means forrendering ,saitl relay inoperative for connecting said source with thelincexcept when said interrupters are at the beginning of the codeseries.

45. In a telephone system, a party-line, a plurality of substations onsaid line, electrically controlled means under the control of thecalling subscriber for signaling said stations according to apredetermined code, a machine common to the exchange for pro ducing thecode signals, and automatic means to lnsure that the code is always;

applied to the line at the beginning. 46. In a telephone system, apartyl ne, a plurality of signals on said line, a source ringingcurrent, a relay for connecting said ringing current with the line, apluwith said line, a plurality of interrupters for controlling vsaidrelay according to a predetermined code, and automatic means under thecontrol of the calling -'subscriber-for controlling. said llne. 1 47. Ina telephone system,

v a par ty-line, a plural ty of ubstationson, said line, :elec-.

of theringing current with the trically contr lled meansgunder-ithecontrol subscriber, ,for automatically sw e ns dering said signalingmeans inoperative excep't at the beginning of the code series.

48. In a telephone system, a party-line, a plurality of signals on saidline at the sub,- stations, a source of ringing current, electric; llycontrolled means under the control. of the calling subscriber forconnecting said ringing current with the line so as to operate saidsignals according to a predetermined code, and automatic means forrendering said connecting means inoperative except at the beginnin; ofthe code series.

49. In a telephone system, a party-line, a plurality of signals on saidline, a source of ringing current, a relay for connecting said ringingcurrent with the line, a plurality of interrupters for cont-rolling saidrelay according to a predetermined code, electrically I controlled meansunder the control or" the calling subscriber for controlling saidconnection of the ringing current with the line, and automatic means forrendering the relay inoperative for connecting said ringing current withthe line except when said inter-- rupters are at tho be inniug of thecode series.

50. In a. telephone system, a party-line, a source of ringing current, arelay'for connect-in g said source with said line, a plurality ofintcrrupters for controlling therelay according to a predetermined code,a step-by-step-operated device under the control of the callingsubscriber for connecting the relay with any desired interrupter, andautomatic means for rendering said relay indpcrative for connecting saidringing current with the line except when said interrupters are at thebeginning of the *code series.

51. In a. teleohone system, a party-line, a plurality of signals on saidline, means ineluding one or more automatic switches for extending a,connection to said line, automatically-controlled means for operatingsaid signals according to a predetermined code, and automatic means forrendering,

said operating vmeans inoperative except at the beginning of the codeseries.

52. In a telephone system, a party-line, a plurality of signals on saidline, means including one or nioreautomatic switches for extending aconnection to said lind-a source of ringing current. means including aplurality of interrupters fouonnecting said source of current to theline so as to operate said signals according to a predetermined code,and automatic means for rendering said connecting means inoperativeexcept at the beginning of the code series.

53. In a telephone system, a party-line, a plurality of signals on saidline, means in Jcluding one or more automatic switches for iextending aconnection to said lines, a source of ringing current, a relay forconnecting said ringing current with the line, a pluralrality ofihterrupters for controllinWsaid relay according to a predeterminedcode, a step-by-step operated dev ce for connecting said relay with anydesired interrupter, and

automatic means for rendering said. relay in operative for connectingsaid source with the line except when said intcrrupters are at thebeginning of the code series,

In a telephone systeroga partydine, a plurality of signals on saidline,ineans ineluding one or more automatic switches for extendingconnection to said line, a source of ringing current, a relay ior.connecting said ringing current with the line, a plural- .ity ofinterrupter-s for controlling said relay according to a predeterminedcode and autoniatic means under the control oi the calling; subscriberfor controlling said connection of the ringing current with the line.

56. In a telephone system, a partydine, a plurality of substations onsaid line, means including one or more automatic switches for extendinga connection to said line, means under the control of the call ng subscriber for automatically signaling saidstations according to, apredetermined'code,

and automatic means for rendering said operating means inope ive exceptat the beginning of the co e series.

57. In a telephone system, a partydine, a plurality of signals on saidline at the substations, means including one or more auto matic switchesfor extending a connection to said line, a source of ringing current,automatic means under the control: of the calling subscriber forconnecting said ringing current with the line so as to operate signalsaccording-to apredeterinined code, and automatic means for rein aringsaid coIinectingimeans inoperative except at the beginning of the codeseries:

In a telephone system, a; party-line, a

plurality of signals on'sa'id line, means including one'or moreautomatic switches for extending a connection to said line, a source iMi except whim said interrupters are at the i of the code .izi ai taiephnne system, a party-line, a source at ringing current Nil mean;f-ni' amine-sting said ringing ent with said line, a piumiity of interruadapt/mi; t0 conti-nl the application 0 iii ringing current to the lineaccordnnotii ai' i Painter, and circuit means new ti'nliiaii. by" saidinst-inentirmed interru iitei pmventing connecting (if said ringing withtin-1 line except Wham. said first- .of a code s ei'iesl n mentionedintcri'uptui's are at the beginning (30. In it telephone system, a trunkline, an automatic impulse transmitter mlaptmito be committed to sziiiltrunk, saiil transmitter including a rotating impulse wheel, anal 11minsfor preventing Slllti impulse transmitter from starting to send impulsesover said trunk excnpt whim. said Wheel is in normal position.

Signed. by me at Chicago, Illinois, this 20th day (if Febr.

TALBOT Cook county, 1920.

MARTlN

